CN112464426A - Method for calculating temperature of strip steel entering zinc pot - Google Patents

Method for calculating temperature of strip steel entering zinc pot Download PDF

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Publication number
CN112464426A
CN112464426A CN201910866215.4A CN201910866215A CN112464426A CN 112464426 A CN112464426 A CN 112464426A CN 201910866215 A CN201910866215 A CN 201910866215A CN 112464426 A CN112464426 A CN 112464426A
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calculating
zinc pot
strip steel
heat
strip
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CN112464426B (en
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王凯
钱洪卫
金鑫焱
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Abstract

The invention discloses a method for calculating the temperature of strip steel entering a zinc pot, which is based on the principle of zinc pot heat balance: input heat quantity QinOutput heat QoutI.e. Qstrip+QP＝QZ+QLFrom Qstrip＝c·(Tstrip‑Tpot) T get: temperature T of strip steel entering zinc potstrip＝Tpot+(QZ+QL－QP) /(c.t); is calculated to obtain
Figure DDA0002201348580000011
Wherein Q isstripHeat, Q, brought in by strip steel entering the zinc potPHeat supply to zinc pot induction heater, QZFor galvanizing heat, QLFor heat loss, TpotThe temperature of the zinc liquid in the zinc pot, t is the calculation cycle time, and c is the average unit linear area specific heat capacity in the calculation cycle time t. The invention can accurately calculate and monitor the temperature of the strip steel entering the zinc pot, thereby further realizing the accurate control of the temperature of the strip steel entering the zinc pot.

Description

Method for calculating temperature of strip steel entering zinc pot
Technical Field
The invention relates to a temperature calculation method in a strip steel processing process, in particular to a calculation method of the temperature of strip steel entering a zinc pot.
Background
With the increasingly strong market competition, users have higher and higher requirements on the surface quality of coated products, such as automobile outer plates and household appliance outer plates, and the coated products have good coating property and corrosion resistance and extremely high surface quality. For a hot galvanizing unit, a zinc pot area is a key factor influencing the surface quality of a hot galvanized steel sheet.
The main component of zinc liquid in a zinc pot of a hot galvanizing unit is zinc and contains a small amount of aluminum, the temperature of the zinc liquid fluctuates in a small temperature range under normal conditions, but when the temperature fluctuation of the zinc liquid is large or the local temperature is low, zinc slag with the main components of Al and Fe elements can be separated out from the zinc liquid, and the zinc slag is attached to strip steel or a sink roll in the zinc pot, so that the zinc slag and scratch defects on the surface of the strip steel are caused, and the surface quality of the strip steel is seriously influenced.
The temperature of the strip steel entering the zinc pot has important influence on the temperature fluctuation of the zinc liquid, particularly on the temperature fluctuation of the zinc liquid at the contact part of the strip steel and the sink roll. In actual production, the temperature of the strip steel entering the zinc pot is detected by a non-contact type temperature detector, the temperature detector indirectly measures the temperature of the strip steel by using a reflection principle, but in production, the specifications of steel types are switched more, and the reflectivity of different steel types is different, so that the detection value fluctuation of the temperature of the strip steel entering the zinc pot is large, the condition of large numerical value deviation often occurs, the temperature of the actual strip steel entering the zinc pot cannot be accurately detected, the accurate control of the temperature of the strip steel entering the zinc pot cannot be realized, and a mature accurate measurement or prediction method of the temperature of the strip steel entering the zinc pot does not exist in the prior art.
Disclosure of Invention
The invention aims to provide a method for calculating the temperature of strip steel entering a zinc pot, which can accurately calculate and monitor the temperature of strip steel entering the zinc pot, thereby further realizing the accurate control of the temperature of strip steel entering the zinc pot.
The invention is realized by the following steps:
a method for calculating the temperature of strip steel entering a zinc pot is disclosed, which comprises the following steps of: input heat quantity QinOutput heat QoutI.e. Qstrip+QP＝QZ+QLFrom Qstrip＝c·(Tstrip-Tpot) T get:
temperature T of strip steel entering zinc potstrip＝Tpot+(QZ+QL－QP)/(c·t)； (1)
Wherein Q isstripHeat, Q, brought in by strip steel entering the zinc potPHeat supply to zinc pot induction heater, QZFor galvanizing heat, QLFor heat loss, TpotThe temperature of the zinc liquid in the zinc pot, t is the calculation cycle time, and c is the average unit linear area specific heat capacity in the calculation cycle time t.
The temperature T of the strip steel entering the zinc potstripThe calculation method specifically comprises the following steps:
step 1: collecting the production parameters of strip steel galvanization, wherein the production parameters of strip steel galvanization comprise the temperature T of zinc liquid in a zinc potpotHigh power value P of induction heater of zinc pothAnd its high power single run time thLow power value P of induction heater of zinc potlAnd its low power single run time tlCalculating the period time t, the number n of produced steel coils in the period time t and the weight m of the produced ith coil of strip steeliWidth of entrance biLength l of entry coiliThe weight m of the surface coating on the outletuiCoating weight m on the lower surface of the outletdiAnd a production time period ti；
Step 2: calculating the calculation cycle time t, wherein the calculation cycle time t comprises the high-power single-time operation time t of the induction heater of the zinc pothAnd low-power single-time operation time t of zinc pot induction heaterlI.e. t ═ th+tl； (2)
And step 3: calculating heat quantity Q provided by induction heater of zinc potPHeat quantity Q provided by induction heater of zinc potPHigh-power single-operation elevator comprising zinc pot induction heaterHeat quantity Q suppliedhHeat Q provided by zinc pot induction heater low-power single operationl(ii) a Wherein, the heat Q provided by the high-power single operation of the zinc pot induction heaterhThe calculation formula of (2) is as follows: qh＝Ph·thHeat Q provided by low-power single-time operation of zinc pot induction heaterlThe calculation formula of (2) is as follows: ql＝Pl·tl；
Namely QP＝Ph·th+Pl·tl； (3)
And 4, step 4: calculating the galvanizing heat quantity QZThe calculation formula is as follows:
QZ＝PZn·t； (4)
wherein, PZnCalculating the average galvanizing heat load in the period time t;
and 5: calculating heat loss QLThe calculation formula is as follows:
QL＝k·t； (5)
wherein k is heat loss power;
step 6: substituting equations (2) through (5) into equation (1) yields:
Figure BDA0002201348560000021
calculating the average galvanizing heat load P in the period time tZnThe calculation method specifically comprises the following steps:
step 4.1: calculating the galvanizing weight mziThe calculation formula is as follows:
Figure BDA0002201348560000022
wherein, biIs the inlet width, /)iIs the length of the inlet steel coil, muiIs the weight of the surface coating on the outlet, mdiThe coating weight of the lower surface of the outlet, i is 1,2, …, n;
step 4.2: calculating the galvanizing heat load PZiThe calculation formula is as follows:
Figure BDA0002201348560000031
wherein, cZIs the reduced specific heat capacity, t, of the zinc bathiThe production time is long;
step 4.3: calculating the average galvanizing heat load P in the period time tZnThe calculation formula is as follows:
Figure BDA0002201348560000032
the reduced specific heat capacity c of the zinc liquidZThe value of (1) is 250-350 kJ/kg.
The value of the heat loss power k is 200 and 500 kW.
The method for calculating the average unit linear area specific heat capacity c in the period t of the calculation cycle specifically comprises the following steps:
step S1: calculating the linear mass rate f of the strip steeliThe calculation formula is as follows:
Figure BDA0002201348560000033
wherein m isiFor the weight of the i-th coil of strip produced, /)iThe length of the inlet steel coil, i is 1,2, …, n;
step S2: calculating the line area S of the strip2iThe calculation formula is as follows:
Figure BDA0002201348560000034
wherein, biIs the inlet width, tiProduction time is used;
step S3: calculating the linear area rate S of the strip steelliThe calculation formula is as follows:
Figure BDA0002201348560000035
step S4: calculating the specific heat capacity c of the unit linear area of the strip steeliThe calculation formula is as follows:
Figure BDA0002201348560000036
wherein, csteelThe specific heat capacity of the strip steel;
step S5: calculating the average unit linear area specific heat capacity c in the calculation period time t, wherein the calculation formula is as follows:
Figure BDA0002201348560000037
the specific heat capacity c of the strip steelsteelThe value of (b) is 0.3-0.7 kJ/(kg-DEG C).
Compared with the prior art, the invention has the following beneficial effects:
1. the invention utilizes the principle of zinc pot heat balance, comprehensively considers the factors influencing the zinc pot heat balance such as the strip steel specification actually produced by the hot galvanizing unit, the process parameters of the zinc pot area, the heat dissipation of the zinc pot and the like, reversely calculates the temperature of the strip steel entering the zinc pot, and can accurately calculate the actual value of the temperature of the strip steel entering the zinc pot, thereby effectively monitoring the temperature of the strip steel entering the zinc pot, further realizing the accurate control of the temperature of the strip steel entering the zinc pot, reducing the zinc slag amount in the zinc pot and improving the surface quality of the strip steel.
2. The invention can replace the measuring instrument for detecting the temperature of the strip steel entering the zinc pot in the prior art, avoid the problems of large temperature measurement error of the measuring instrument and large disturbance of the temperature of the zinc liquid, meet the requirement of a hot galvanizing unit on the accurate control of the temperature of the strip steel entering the zinc pot, reduce the zinc slag amount in the zinc pot and further improve the surface quality of products.
The invention can accurately calculate and monitor the temperature of the strip steel entering the zinc pot, and solves the problem of large error of the temperature of the strip steel entering the zinc pot detected by a temperature detector in the prior art, thereby further realizing the requirement of a hot galvanizing unit on the accurate control of the temperature of the strip steel entering the zinc pot, reducing the zinc slag amount in the zinc pot, and improving the surface quality of the strip steel.
Drawings
FIG. 1 is a flow chart of the method for calculating the temperature of the strip steel entering a zinc pot.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached figure 1, a method for calculating the temperature of strip steel entering a zinc pot is disclosed, according to the heat balance principle of the zinc pot: input heat quantity QinOutput heat QoutI.e. Qstrip+QP＝QZ+QLFrom Qstrip＝csteel·m·△T＝csteel·m·(Tstrip－Tpot)＝c·(Tstrip-Tpot) T, can be:
temperature T of strip steel entering zinc potstrip＝Tpot+(QZ+QL－QP)/(c·t)； (1)
Wherein Q isstripHeat, Q, brought in by strip steel entering the zinc potPHeat supply to zinc pot induction heater, QZFor the yield-related galvanizing heat, QLFor heat losses independent of production, TpotThe temperature of the zinc liquid in the zinc pot is calculated, t is the calculation cycle time, and c is the average unit linear area specific heat capacity in the calculation cycle time t; c. CsteelIs the specific heat capacity of the strip steel, and m is the weight of the produced strip steel.
Output heat QoutGenerally comprises zinc pot heat dissipation, air knife heat dissipation, slag dragging heat dissipation, zinc ingot heat dissipation and the like, and can be classified into heat loss Q irrelevant to yieldLAnd the yield-related galvanizing heat load QZ。
The temperature T of the strip steel entering the zinc potstripThe calculation method specifically comprises the following steps:
step 1: collecting the production parameters of strip steel galvanization, wherein the production parameters of strip steel galvanization comprise the temperature T of zinc liquid in a zinc potpotZinc, zincHigh power value P of pot induction heaterhAnd its high power single run time thLow power value P of induction heater of zinc potlAnd its low power single run time tlCalculating the period time t, the number n of produced steel coils in the period time t and the weight m of the produced ith coil of strip steeliWidth of entrance biLength l of entry coiliThe weight m of the surface coating on the outletuiCoating weight m on the lower surface of the outletdiAnd a production time period ti。
Step 2: calculating the calculation cycle time t, wherein the calculation cycle time t comprises the high-power single-time operation time t of the induction heater of the zinc pothAnd low-power single-time operation time t of zinc pot induction heaterlI.e. t ═ th+tl。 (2)
And step 3: calculating heat quantity Q provided by induction heater of zinc potPHeat quantity Q provided by induction heater of zinc potPComprises heat Q provided by high-power single operation of an induction heater of a zinc pothHeat Q provided by zinc pot induction heater low-power single operationl(ii) a Wherein, the heat Q provided by the high-power single operation of the zinc pot induction heaterhThe calculation formula of (2) is as follows: qh＝Ph·thHeat Q provided by low-power single-time operation of zinc pot induction heaterlThe calculation formula of (2) is as follows: ql＝Pl·tl；
Namely QP＝Ph·th+Pl·tl。 (3)
And 4, step 4: calculating the galvanizing heat quantity QZThe calculation formula is as follows:
QZ＝PZn·t； (4)
wherein, PZnIn order to calculate the average galvanizing heat load in the period time t, the calculation method specifically comprises the following steps:
step 4.1: calculating the galvanizing weight mziThe calculation formula is as follows:
Figure BDA0002201348560000051
unit kg; (12)
wherein, biIs the inlet width, /)iIs the length of the inlet steel coil, muiIs the weight of the surface coating on the outlet, mdiThe coating weight of the lower surface of the outlet is 1,2, …, n.
Step 4.2: calculating the galvanizing heat load PZiThe calculation formula is as follows:
Figure BDA0002201348560000052
unit kW; (13)
wherein, cZThe specific heat capacity is obtained by regression according to a large amount of data, and the value is usually 250-350 kJ/kg; t is tiFor production time.
Step 4.3: calculating the average galvanizing heat load P in the period time tZnThe calculation formula is as follows:
Figure BDA0002201348560000053
and 5: calculating heat loss QLThe calculation formula is as follows:
QL＝k·t； (5)
wherein k is heat loss power, is related to heat loss of the zinc pot, and is obtained by regression according to a large amount of data, and is usually 200-500 kW.
Step 6: substituting equations (2) through (5) into equation (1) yields:
Figure BDA0002201348560000061
the method for calculating the average unit linear area specific heat capacity c in the period t of the calculation cycle specifically comprises the following steps:
step S1: calculating the linear mass rate f of the strip steeliThe calculation formula is as follows:
Figure BDA0002201348560000062
the unit is kg/m; (7)
wherein m isiFor the weight of the i-th coil of strip produced, /)iThe entry coil length i is 1,2, …, n.
Step S2: calculating the line area S of the strip2iThe calculation formula is as follows:
Figure BDA0002201348560000063
unit is m2/min； (8)
Wherein, biIs the inlet width, tiThe production time is.
Step S3: calculating the linear area rate S of the strip steelliThe calculation formula is as follows:
Figure BDA0002201348560000064
the unit is m. (9)
Step S4: calculating the specific heat capacity c of the unit linear area of the strip steeliThe calculation formula is as follows:
Figure BDA0002201348560000065
in kW/deg.C; (10)
wherein, csteelThe specific heat capacity of the strip steel is usually 0.3-0.7 kJ/(kg-DEG C).
Step S5: calculating the average unit linear area specific heat capacity c in the calculation period time t, wherein the calculation formula is as follows:
Figure BDA0002201348560000066
example 1:
collecting production parameters of strip steel and zinc plating: temperature T of zinc liquid in zinc potpot455 deg.C high power P for induction heater of zinc poth800kW, zinc pot induction heater low power value Pl＝248kW，High power single run time th29min, low power single run time tl92 min; collecting the number n of produced steel coils in the calculation period t to be 6, namely taking 1,2, … and 6 as i, wherein the weight m of the produced 6 coils of strip steeliWidth of entrance biLength l of entry coiliThe weight m of the surface coating on the outletuiCoating weight m on the lower surface of the outletdiAnd a production time period tiAs shown in table 1.
TABLE 1 information sheet for 6 coils of strip produced during a calculation cycle time t
Figure BDA0002201348560000071
Calculating the cycle time t ═ th+tl＝29+92＝121min。
Calculating the linear quality rate f of the i-th coil strip according to the formulas (7) to (10), (11) and (12)iLinear area ratio SliLine area S2iZinc plating weight mZiGalvanizing heat load PZiAnd specific heat capacity per unit area ci(ii) a Specifically, as shown in table 2.
TABLE 2 parameter table for ith winding band steel in calculation period time t
Figure BDA0002201348560000072
Calculating the average unit linear area specific heat capacity c in the period time t:
Figure BDA0002201348560000073
calculating the average galvanizing heat load P in the period time tZ：
Figure BDA0002201348560000074
Calculating the temperature T of the strip steel entering the zinc potstripHeat lossThe power k is 359.17 kW:
Figure BDA0002201348560000081
the measuring instrument for the temperature of the strip steel entering the zinc pot is calibrated when the unit is stopped and fixed for maintenance, the accuracy of a detection value in a short time after calibration can be ensured, the average value of the detection of the temperature of the strip steel entering the zinc pot in the calculation cycle time t of the embodiment after the unit is started is 463.4 ℃, and the average value is consistent with a calculated value, so the temperature of the strip steel entering the zinc pot calculated by the method has higher accuracy, and the temperature of the strip steel entering the zinc pot can be accurately calculated and monitored.
Example 2:
collecting production parameters of strip steel and zinc plating: temperature T of zinc liquid in zinc potpotHigh power value P of induction heater for zinc pot at 452 deg.Ch681kW, zinc pot induction heater low power value Pl227kW, high power single run time th25min, low power single run time tl19 min; collecting the number n of the produced steel coils in the calculation period time t to be 2, namely taking 1 and 2 for i, wherein the weight m of the produced 2 coils of strip steeliWidth of entrance biLength l of entry coiliThe weight m of the surface coating on the outletuiCoating weight m on the lower surface of the outletdiAnd a production time period tiAs shown in table 3.
TABLE 3 information sheet for 2 coils of strip produced during the calculation of the cycle time t
Figure BDA0002201348560000082
Calculating the cycle time t ═ th+tl＝25+19＝44min。
Calculating the linear quality rate f of the i-th coil strip according to the formulas (7) to (10), (11) and (12)iLinear area ratio SliLine area S2iZinc plating weight mZiGalvanizing heat load PZiAnd specific heat capacity per unit area ci(ii) a The details are shown in Table 4.
TABLE 4 parameter table for ith winding band steel in calculation period time t
Figure BDA0002201348560000083
Calculating the average unit linear area specific heat capacity c in the period time t:
Figure BDA0002201348560000091
calculating the average galvanizing heat load P in the period time tZ：
Figure BDA0002201348560000092
Calculating the temperature T of the strip steel entering the zinc potstripAnd 359.17kW is taken as heat loss power k:
Figure BDA0002201348560000093
the measuring instrument for the temperature of the strip steel entering the zinc pot is calibrated when the unit is shut down and fixed for maintenance, the accuracy of a detection value in a short time after calibration can be ensured, the average value of the detection of the temperature of the strip steel entering the zinc pot in the calculation period t of the embodiment after the unit is started is 451 ℃, and the average value is consistent with a calculated value, so that the temperature of the strip steel entering the zinc pot calculated by the method has higher accuracy, and the temperature of the strip steel entering the zinc pot can be accurately calculated and monitored.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A method for calculating the temperature of strip steel entering a zinc pot is characterized by comprising the following steps: according to the heat balance principle of a zinc pot: input heat quantity QinOutput heat QoutI.e. Qstrip+QP＝QZ+QLFrom Qstrip＝c·(Tstrip-Tpot) T get:
temperature T of strip steel entering zinc potstrip＝Tpot+(QZ+QL－QP)/(c·t)； (1)
Wherein Q isstripHeat, Q, brought in by strip steel entering the zinc potPHeat supply to zinc pot induction heater, QZFor galvanizing heat, QLFor heat loss, TpotThe temperature of the zinc liquid in the zinc pot, t is the calculation cycle time, and c is the average unit linear area specific heat capacity in the calculation cycle time t.
2. The method for calculating the temperature of the strip steel in the zinc pot according to claim 1, which is characterized in that: the temperature T of the strip steel entering the zinc potstripThe calculation method specifically comprises the following steps:
step 1: collecting the production parameters of strip steel galvanization, wherein the production parameters of strip steel galvanization comprise the temperature T of zinc liquid in a zinc potpotHigh power value P of induction heater of zinc pothAnd its high power single run time thLow power value P of induction heater of zinc potlAnd its low power single run time tlCalculating the period time t, the number n of produced steel coils in the period time t and the weight m of the produced ith coil of strip steeliWidth of entrance biLength l of entry coiliThe weight m of the surface coating on the outletuiCoating weight m on the lower surface of the outletdiAnd a production time period ti；
Step 2: calculating the calculation cycle time t, wherein the calculation cycle time t comprises the high-power single-time operation time t of the induction heater of the zinc pothAnd low-power single-time operation time t of zinc pot induction heaterlI.e. t ═ th+tl； (2)
And step 3: calculating heat quantity Q provided by induction heater of zinc potPHeat quantity Q provided by induction heater of zinc potPComprises heat Q provided by high-power single operation of an induction heater of a zinc pothFeel like a zinc potHeat quantity Q provided by low power single operation of heaterl(ii) a Wherein, the heat Q provided by the high-power single operation of the zinc pot induction heaterhThe calculation formula of (2) is as follows: qh＝Ph·thHeat Q provided by low-power single-time operation of zinc pot induction heaterlThe calculation formula of (2) is as follows: ql＝Pl·tl；
Namely QP＝Ph·th+Pl·tl； (3)
And 4, step 4: calculating the galvanizing heat quantity QZThe calculation formula is as follows:
QZ＝PZn·t； (4)
wherein, PZnCalculating the average galvanizing heat load in the period time t;
and 5: calculating heat loss QLThe calculation formula is as follows:
QL＝k·t； (5)
wherein k is heat loss power;
step 6: substituting equations (2) through (5) into equation (1) yields:
Figure FDA0002201348550000021
3. the method for calculating the temperature of the strip steel in the zinc pot according to claim 2, which is characterized in that: calculating the average galvanizing heat load P in the period time tZnThe calculation method specifically comprises the following steps:
step 4.1: calculating the galvanizing weight mziThe calculation formula is as follows:
Figure FDA0002201348550000022
wherein, biIs the inlet width, /)iIs the length of the inlet steel coil, muiIs the weight of the surface coating on the outlet, mdiIs an outletLower surface coating weight, i ═ 1,2, …, n;
step 4.2: calculating the galvanizing heat load PZiThe calculation formula is as follows:
Figure FDA0002201348550000023
wherein, cZIs the reduced specific heat capacity, t, of the zinc bathiThe production time is long;
step 4.3: calculating the average galvanizing heat load P in the period time tZnThe calculation formula is as follows:
Figure FDA0002201348550000024
4. the method for calculating the temperature of the strip steel in the zinc pot according to claim 3, which is characterized in that: the reduced specific heat capacity c of the zinc liquidZThe value of (1) is 250-350 kJ/kg.
5. The method for calculating the temperature of the strip steel in the zinc pot according to claim 2, which is characterized in that: the value of the heat loss power k is 200 and 500 kW.
6. The method for calculating the temperature of the strip steel in the zinc pot according to the claim 1 or 2, which is characterized in that: the method for calculating the average unit linear area specific heat capacity c in the period t of the calculation cycle specifically comprises the following steps:
step S1: calculating the linear mass rate f of the strip steeliThe calculation formula is as follows:
Figure FDA0002201348550000025
wherein m isiFor the weight of the i-th coil of strip produced, /)iThe length of the inlet steel coil, i is 1,2, …, n;
step S2: calculating beltLine area S of steel2iThe calculation formula is as follows:
Figure FDA0002201348550000026
wherein, biIs the inlet width, tiProduction time is used;
step S3: calculating the linear area rate S of the strip steelliThe calculation formula is as follows:
Figure FDA0002201348550000031
step S4: calculating the specific heat capacity c of the unit linear area of the strip steeliThe calculation formula is as follows:
Figure FDA0002201348550000032
wherein, csteelThe specific heat capacity of the strip steel;
step S5: calculating the average unit linear area specific heat capacity c in the calculation period time t, wherein the calculation formula is as follows:
Figure FDA0002201348550000033
7. the method for calculating the temperature of the strip steel in the zinc pot according to claim 6, which is characterized in that: the specific heat capacity c of the strip steelsteelThe value of (b) is 0.3-0.7 kJ/(kg-DEG C).
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Citations (7)

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